[kach22i]

I'm not sure what to make of it.

However I'm not going to assume that a clean removal of moisture off the rear window is the result of attached or non-buffeting air flow.

The passenger side may be more revealing because the vortex of air which forms as two different airflows and air pressures meeting at the rear pillars or blind-spots (over the top air travel and along the side air) is less disturbed because of side mirror delete.